Cemer thomas colebrook



(No Model.)

Q. T. GOLEBROOK. I ROTARY PUMP 0R SIMILAR APPARATUS.

No. 345,885. Patent-ed July 20,- 1886.

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fnyenloz (zine/7 22. CoZer-ook 5 his filter-megs m raining casing. The principal UNITED STATES? ATENT. OFFICE.

CEMER THOMAS ooLnBnoo orisnmeron, COUNTY or MIDDLESEX,

ENGL ND.

ROTARY PUMP oR SllVl'lLA'R APPARATUS.

SPECIFICATION forming part of Letters Patent No..345,885, dated July 20, 1886. Application filed January 14, Iss6. Scrial'No. 188,558; (N6 model.) Patented in England April 1, 1885, No. 4,143;

To'alZ whom it may concern.- v

Be it known that I, GEMER THOMAS C LE- BROOK,3. subject of the Queen of Great Britain and Ireland, and a resident of Islington, in the county of Middlesex, England, have invented certain'Improvements in- Rotary Pumps or Similar Apparatus, (for which I have obtained British Letters Patent No. 4,143, dated April $1885) of which the following is a specificaion. The invention has especial reference to that class of such rotary apparatus in which there isjmounted within and eccentrically or otherwise in relation to an outer cylinder 0r casing formed or provided-withinlet and outlet passages a-nd with end covers,a cylindrical-rotary drum or center piece accurately fitting (with facility of turning against a segment of the inner surfaceor periphery of the cylinder,and also between such end covers, and keyed or fixed upon or securely fitted on or to an axle or shaft passing through one or both such end covers, and formed in .its periphery with a series of longitudinal recesses or grooves, in

which loosely fitting cylindrical rollers or equivalent devices of a solid or hollow formation are placed.

The principle of action sought to be attained in rotary apparatus of this class is that when the drum is rotated the said rollers shall roll freely around in their respective grooves in such a manner as t9 remain at all parts of their revolution round the' center of the said casing, or f0r-such part thereof .as they are required to act in contact with the inner surface or periphery thereof, so as to act as true pistons at all times and parts of their said revolution,0r for such times and parts of their said revolution as required to act in effecting a tight joint both between their peripheries. and the driving or driven edges of their respective groovesand between their periphcries and the inner periphery of the said condefect in' such apparatus as hitherto constructed is that the roller-pistons have been liable to be carried around with the druni in some constructions without being in thcrdesir'ed contact with theinner eccentric peripherybf the casing, and in other con-r V structions for the earlier part of its revolution after'leaving the said segment and'until after they are required to begin acting in concert with the inner peripheries of the casing without being in contact therewith, and to be then suddenly impelled outward against the said inner periphery of the casing withIa consid-- j erable and destructive force, rendering the apparatus practically useless on account of vthe physically unbearable hammering noise thus caused. It has been sought tb remedy these defects by forming bosses upon the end covers concentric with the inner periphery of the casing, so as to cause the rollers to travel always i n contact therewith, but this provislon of necessity prevented the eccentric drum from rotating in even contact with the end covers, and thus prevented the apparatus from having any useful effect.

The special object of the present i mprovements is to remedy such defects,- and to apply such improvements to such apparatus as W1.

cause the above referred to principle of action to be attained.

, In the accompanying drawings, Figure 1 represents a rotary pump constructed inaccordance with one modification of the present longitudinal recesses or groovesin theperiphimprovements, Fig; 2 represents a detail cry of the drum, and 9 the roller-pistons,

which are required to be carried round there by in contact with the periphery of the cylinder 1, as and at the times required.

, The invention consists, essentially, in adapting such improvements to the drum as Wlll be .efi'ective in causing it to have a constant positive tendency to thrust such roller-pistons outward, and to keep them in contact with the inner periphery of the casing at all parts of their said revolution or while they are required to operate therewith.

In such cases wherein the rollers 9 are required to be severally independent from each other, as illustrated in Fig. 1, the improvedmeans of actuation consist in constructing the est width) of suchspace,

V tance therefromof their drum in such a manner as that the driving (or driven) side 10 in single-acting rotaryapparatus, or sides 10 in double-acting or reversible rotary apparatus of the grooves 8 for the whole extent of such side or sides, or for such aeting'part thereof as is effective or in-' strumental in propellingthe roller-pistons from the position they occupy at the time they begin to not after leaving the said segment until the position they occupy at the time of reaching-the" outlet iso'r' are disposed; in relation to the center of the drum as the center of actuation in a plane either radial therefrom, as in'the modification represented, or radial from any point (referringto a trans, verse sectional view) on'eithcr side of such center of actuation situated anywhere-within a circle drawn about such center, and of the diameter of the rollers in use, making the grooves, when applying the drum to a rotary pump, of such a width as to leave plenty of lateral clearance for the rollers and for the fluid being pumped, and when applying the drum to an engine, making the grooves with the least amount possible of clearancefor the rollers. When the drum thus formed is mounted withinthe casing or cylinder -1, formed or provided as herein referred to, and as illustrated in the accompanying drawings, and is rotated by hand by means of a handle on asquared extremity of the drum-. shaft 7, or is otherwise rotated or driven, the rollers 9 will. have a positive force tending to roll them out. of the said grooves and away -from ,the center of the drum and against the internal surface of the casing, so that there will be a complete avoidance of such sudden impulses and destructive hammering in such apparatus as hitherto constructed, The rollers 9 are made'of such proportional sizes or diameters in relation to the width of thespacc between the drum and easing, (or to the greatest width of such space," if varying,) as that while or throughoutthe time they aretravel'sing the periphery of the casing between the inlet and the outlet, the rollers are positively supported, with the said outward tendency, by or against the edges or actingparts 10 of thegrooves of the drum-at some part of them nearer the center of. actuation than the disaxes. To attain this resultthe rollers may be made of a diameter somewhat less than double the wi dth (or greatof a diameter so much larger than the width (or greatest width) of such space-as willavoid any liability of the rollers jamming in any part thereof, or of any intermediatediameter;

For the purpose of securing the most advantageous operation and evenness of work in a pump constructed as represented in Fig. 1, I cause the outlet 3'therefrom to be situated at or to extend from the'commencement of -the segment 6 of the casing 1, against which the drum 5 rotates, to-that point of the crescent space at which the roller b,coming into operation,will be situatedat the inoment when the varying cubic capacity between the two acting roller-pistons a b is the-greatest, or when or immediately after the said space is fully charged. The cylinder may, however, be so shaped as thatthe cubic capacity bctweeirthe two acting roller pistons will remain constant from the moment of being fully chargcd'unti'l the moment ofjthe commencement of escape of the material under treatment, by so form ing and constructing the casing as that the parttraversed by the rollers from the. time of passing the inletuntil the time of reaching the out-let shall be concentric with the periphery of the drum, the concentric parts of the casing of different diameters being connected rollers gradually altering their radial distances from the center of actuation.

I prefer, in apparatus of small size, to construct the drum 5 in one piece, with projecting ends or axles'7. I form the end cover or covers 4 of rotary pumps in such animproyed -by parts so shaped as to cause or allowof the manner as thattheyrequire no packing-glands,

and form and adapt the rotating drum thereto where it abuts thereagainst, so as to prevent leakage more than sufficient to lubricate the adjacent parts, and this result I attain by annularly recessing the end covers'at parts 13, surrounding the shaft near adjacent to their faces, as represented in the sectional detail view, Fig. 2, and by leading ducts 14 from such recesses to the faces of the covers on the suction side of the drum, when in operation, so that anysmall leakage around the shaft on the delivery side of necessityfinds its way into these annular recesses, and is immediatelydrawn back into the casing on the suction side.

I claim as m yinvention in rotary apparatus of the class hereinbefore described.-

The combination of a casing having inlet and outlet passages with a rotary drum or center piece having recesses in its periphery and roller-pistons therein, thesaid recesses having acting faces substantially radial from the center of rotation, as and for the purpose set forth.

Intestimony I have signed my name to this specification in the presenceof two subscribing witnesses. v

CEMER THOMAS COLEBROOK.

Witnesses:

CHARLES AUBREY DAY,

WILLIAM JAMES ALDER, 27 Leadenhall St London. 

